* [Bug tapsets/3279] New: timer.profile broken on 2.6.18 x86_64
@ 2006-09-28 19:44 hunt at redhat dot com
2006-09-28 21:59 ` [Bug tapsets/3279] " joshua dot i dot stone at intel dot com
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: hunt at redhat dot com @ 2006-09-28 19:44 UTC (permalink / raw)
To: systemtap
To reproduce run systemtap.base/timers.stp
It works on 2.6.17 i686
Does not on 2.6.18 x86_64.
systemtap starting probe
systemtap ending probe
p = 0
j1 = 3983
j2 = 3509
jmax = 0
ms1 = 8756
ms500 = 70
msmax = 0
unexpected profile count: 0 profiles and 3983 jiffies
systemtap test failure
systemtap test success
systemtap test success
systemtap test success
--
Summary: timer.profile broken on 2.6.18 x86_64
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P1
Component: tapsets
AssignedTo: systemtap at sources dot redhat dot com
ReportedBy: hunt at redhat dot com
http://sourceware.org/bugzilla/show_bug.cgi?id=3279
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* [Bug tapsets/3279] timer.profile broken on 2.6.18 x86_64
2006-09-28 19:44 [Bug tapsets/3279] New: timer.profile broken on 2.6.18 x86_64 hunt at redhat dot com
@ 2006-09-28 21:59 ` joshua dot i dot stone at intel dot com
2006-09-29 0:25 ` hunt at redhat dot com
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: joshua dot i dot stone at intel dot com @ 2006-09-28 21:59 UTC (permalink / raw)
To: systemtap
------- Additional Comments From joshua dot i dot stone at intel dot com 2006-09-28 21:59 -------
Can you give more details about your setup? It works fine for me on x86_64
2.6.18-1.2689.fc6.
If it's a Xen kernel, then this is a known issue. On both Xen dom0 and domU,
timer.profile successfully registers its callback but never gets any hits. We
don't have a bugzilla for it though, so we might want to retask this bug.
--
http://sourceware.org/bugzilla/show_bug.cgi?id=3279
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* [Bug tapsets/3279] timer.profile broken on 2.6.18 x86_64
2006-09-28 19:44 [Bug tapsets/3279] New: timer.profile broken on 2.6.18 x86_64 hunt at redhat dot com
2006-09-28 21:59 ` [Bug tapsets/3279] " joshua dot i dot stone at intel dot com
@ 2006-09-29 0:25 ` hunt at redhat dot com
2006-09-29 1:04 ` [Bug tapsets/3279] timer.profile broken on Xen kernels joshua dot i dot stone at intel dot com
2006-11-20 21:44 ` fche at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: hunt at redhat dot com @ 2006-09-29 0:25 UTC (permalink / raw)
To: systemtap
------- Additional Comments From hunt at redhat dot com 2006-09-29 00:24 -------
(In reply to comment #1)
> If it's a Xen kernel, then this is a known issue. On both Xen dom0 and domU,
Indeed all the kernels that failed were either dom0 or domU.
--
http://sourceware.org/bugzilla/show_bug.cgi?id=3279
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* [Bug tapsets/3279] timer.profile broken on Xen kernels
2006-09-28 19:44 [Bug tapsets/3279] New: timer.profile broken on 2.6.18 x86_64 hunt at redhat dot com
2006-09-28 21:59 ` [Bug tapsets/3279] " joshua dot i dot stone at intel dot com
2006-09-29 0:25 ` hunt at redhat dot com
@ 2006-09-29 1:04 ` joshua dot i dot stone at intel dot com
2006-11-20 21:44 ` fche at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: joshua dot i dot stone at intel dot com @ 2006-09-29 1:04 UTC (permalink / raw)
To: systemtap
------- Additional Comments From joshua dot i dot stone at intel dot com 2006-09-29 01:04 -------
On Xen kernels, the callback registration for timer.profile is successful (via
register_timer_hook), but it never gets called because profile_tick is never called.
If anyone really needs this, you can approximate the same functionality like so:
function __set_regs(regs:long) %{
CONTEXT->regs = (struct pt_regs *)(long)THIS->regs;
%}
probe fake.timer.profile = kernel.function("timer_interrupt") {
__set_regs($regs)
}
... but this has much higher overhead. It would be nicer to find a patch for
Xen so that it calls profile_tick properly.
--
What |Removed |Added
----------------------------------------------------------------------------
Summary|timer.profile broken on |timer.profile broken on Xen
|2.6.18 x86_64 |kernels
http://sourceware.org/bugzilla/show_bug.cgi?id=3279
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* [Bug tapsets/3279] timer.profile broken on Xen kernels
2006-09-28 19:44 [Bug tapsets/3279] New: timer.profile broken on 2.6.18 x86_64 hunt at redhat dot com
` (2 preceding siblings ...)
2006-09-29 1:04 ` [Bug tapsets/3279] timer.profile broken on Xen kernels joshua dot i dot stone at intel dot com
@ 2006-11-20 21:44 ` fche at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: fche at redhat dot com @ 2006-11-20 21:44 UTC (permalink / raw)
To: systemtap
------- Additional Comments From fche at redhat dot com 2006-11-20 21:12 -------
Rik van Riel kindly fixed this kernel bug.
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=214886
--
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
http://sourceware.org/bugzilla/show_bug.cgi?id=3279
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end of thread, other threads:[~2006-11-20 21:12 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2006-09-28 19:44 [Bug tapsets/3279] New: timer.profile broken on 2.6.18 x86_64 hunt at redhat dot com
2006-09-28 21:59 ` [Bug tapsets/3279] " joshua dot i dot stone at intel dot com
2006-09-29 0:25 ` hunt at redhat dot com
2006-09-29 1:04 ` [Bug tapsets/3279] timer.profile broken on Xen kernels joshua dot i dot stone at intel dot com
2006-11-20 21:44 ` fche at redhat dot com
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